Payments - Introduction / Learning brief
CBDC and digital money
Your notes
In simple terms / 01
What this means in plain language
A central bank digital currency is a digital form of central-bank money. This article explains wholesale and retail designs, why central banks study them, and how they sit alongside commercial-bank money and existing payment rails.
A CBDC (central bank digital currency) is money issued directly by a central bank, held in digital form rather than as physical cash. Today most money people use is commercial-bank money, a claim on the private bank where an account sits. Central-bank money already exists digitally for banks, through reserve accounts, but not for the general public beyond notes and coins. A CBDC would extend a direct claim on the central bank into a digital form. Designs fall into two broad groups. Wholesale CBDC serves banks and large institutions for settlement. Retail CBDC would be available to households and businesses for everyday payments. Central banks study these options to keep public money useful in a digital economy, support resilience, and test new settlement methods. A CBDC is not a replacement for existing rails; it is one more form of money that must connect to them.
Complete lesson / 02
Understand the full idea, step by step
Take a banknote out of your wallet and look at who stands behind it: the central bank itself. Now open your banking app — that balance is a promise from a private company. The two feel identical at the checkout, but they are claims on entirely different institutions. A central bank digital currency asks a simple question: what if the first kind of money could live in your phone too?
Two kinds of money already exist
The note is central-bank money: a direct claim on Central Bank Omega, usable by anyone, with no private company in between. The account balance is commercial-bank money: a claim on Bank Alfa, which is a private institution that could — however rarely — fail, which is exactly why deposit protection schemes exist. Banks themselves already hold central-bank money digitally, as reserve balances used to settle with each other across Central Bank Omega's books. So digital central-bank money is not new; what would be new is the public holding it.
CBDC — central bank digital currency
A CBDC is central-bank money issued in digital form. Like a banknote, it is a direct claim on the central bank; like an account balance, it exists as an electronic record rather than paper. It is not a new currency — a digital rupee would still be a rupee — but a new form of the existing one, sitting alongside cash and deposits rather than replacing them.
| Cash | Bank deposit | E-money wallet | Retail CBDC | |
|---|---|---|---|---|
| Your claim is on | Central Bank Omega | Bank Alfa | The wallet issuer | Central Bank Omega |
| Form | Physical note | Entry in the bank's ledger | Stored value, redeemable at par | Digital record |
| If the issuer fails | Central-bank money does not default in its own currency | Deposit protection applies, within limits | Safeguarding rules apply, not deposit protection | Same standing as cash |
Wholesale and retail are different projects
CBDC designs split into two families. A wholesale CBDC is restricted to banks and financial institutions and used to settle between them — close to today's reserve accounts, but exploring new mechanics such as tokenised ledgers where payment and delivery of an asset can happen together. A retail CBDC would reach households and businesses as a digital form of cash. Retail raises the harder questions, because it touches everyone: privacy, offline use, holding limits, and what happens to commercial banks if the public shifts deposits into central-bank money. Most designs discussed publicly are two-tier: the central bank issues the money, while banks and licensed firms run the wallets, the customer checks, and the support.
You may be wondering: if a claim on the central bank is safer, why would anyone keep money at Bank Alfa at all?
Partly because deposits do things a digital note does not — earn interest, back lending, come with overdrafts and payment services. And partly by design: retail CBDC proposals commonly discuss holding limits and unremunerated balances precisely so that the new form of money complements deposits rather than draining them. The design question every central bank studies is coexistence, not replacement.
COMMON CONFUSION
“A CBDC is the central bank's own cryptocurrency, so its value would float like a crypto-asset.”
A CBDC is the national currency itself in digital form — one digital unit is one unit, exactly as one note is. Some designs borrow technology associated with crypto-assets, such as tokenised ledgers, but the money remains a central-bank liability with a fixed value in its own currency. Technology choice and what the money *is* are separate questions.
STRICTLY SPEAKING
Strictly speaking, everything above describes design families, not any live system. Real programmes differ widely by jurisdiction — in motivation, architecture, privacy model, and whether they proceed at all — and most public work remains research or pilot-stage exploration. Studying a design is not a decision to issue, so treat any claim about a specific country's CBDC status as dated the moment it is written, and check that jurisdiction's central bank directly.
REMEMBER IT
Sort any money by asking who owes it to you. Central bank → cash and CBDC. Commercial bank → deposits. A licensed firm → e-money. The form — paper, ledger entry, token — matters less than the name behind the claim.
FOR NOW, REMEMBER
- Cash is a claim on the central bank; a deposit is a claim on a commercial bank — the same rupee, different promisors.
- A CBDC is central-bank money in digital form: a new form of the existing currency, not a new currency.
- Wholesale designs serve settlement between institutions; retail designs would reach the public and raise privacy, offline, and deposit-shift questions.
- Designs vary by jurisdiction and most programmes are research or pilots — coexistence with cash and deposits is the stated aim.
TRY IT YOURSELF
Central Bank Omega's retail pilot goes live and Riya loads INR 2,000.00 of CBDC into a wallet app operated by Bank Alfa. Bank Alfa later fails. What is the most accurate view of Riya's CBDC balance?
Central banks are not the only ones issuing digital claims. Next: privately issued tokens that promise a stable value — and why the promise is only as good as the reserves and the right to redeem them.
KEEP GOINGKey takeaways / 03
Three things to remember
- 01
A CBDC is a digital form of central-bank money, a direct claim on the central bank.
- 02
Wholesale designs serve banks for settlement; retail designs serve the public for everyday payments.
- 03
A CBDC would sit alongside commercial-bank money and cash, not automatically replace them.
Practical use cases / 04
Where you would use this
A central bank runs a wholesale pilot so banks can settle interbank transfers in central-bank money on a new ledger.
A policy team studies a retail design to keep public money accessible as physical cash use declines.
A commercial bank models how a retail CBDC would interact with customer deposits and existing account rails.
Worked example / 05
Put the idea into a real situation
Illustrative example: a fictional central bank, the Reserve of Calibra, runs a wholesale pilot with eight participating banks. A member, a fictional bank named Meridian Trust, settles an interbank obligation of EUR 5,000,000.00 to another member. Instead of moving reserve balances through the existing RTGS (real-time gross settlement) system, the two banks exchange a tokenised claim on the Reserve of Calibra that settles within 4 seconds. The pilot measures settlement time and reconciliation effort against the current process over an eight-week window.
Evidence & review / 07
Evidence & review
Jurisdiction-neutral design families (wholesale, retail, two-tier); no claims about any specific country's CBDC status
What this brief simplifies: Deposit protection and e-money safeguarding are summarised in one line each; limits and mechanics vary by jurisdiction. Tokenised-ledger settlement is mentioned without technical detail. The pilot is fictional.
Sources for this brief2
- Market practiceMarch 2003 edition
A glossary of terms used in payments and settlement systems ↗ — CPSS (now CPMI), Bank for International Settlements · Central bank money, commercial bank money, settlement asset
Terminology has evolved since this edition; newer CPMI publications refine some definitions.
- Simplified educational illustration
Payments Signal editorial teaching models — Payments Signal · Riya / Central Bank Omega pilot scenario; two-tier teaching model
Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.